59$ Dr. fothergill’s Account of 
fig. 2. is perforated with fixty holes, one againft the end 
of each bar, as fhewn at fig. 3. with a fcrew fitted to 
each hole, as fhewn at fig. 4.: every fcrew having a 
fquare head as at fig. 5. may, by help of the key fig. 6. 
be turned, and, by prefling againft the end of the bar in 
the fourth length, force it againft its abutting bar in the 
third length, and fo on till the bars, end to end, are 
brought into contact and kept fo. The braces are in 
two pieces; the fides and bottom in one; and the other 
piece forms the top a a, which is held clofe to the bars 
by the fcrews palling through it into the upright fides 
of the braces ; and, to keep the braces at n and s fteadily 
in their places, the two long braces cc are affixed. 
As each of thefe magazines weighed about 500 lbs. 
it became neceffary to have them fo placed as to be con- 
veniently ufed. The doctor, therefore, by fcrews fixed 
the braces, containing the bars, to a ftrong mahogany 
plank dd, about i| inches thick; the fcrews palling 
through the plank entered the bottom parts of the braces 
a a. Againft the middle of the whole length, two ftrong 
brafs plates are well fixed to the fides of the plank; to 
thefe brafs plates are fixed two cylindrical gudgeons f, 
which projecting from the lides, like the trunnions of a 
cannon, lye in the fockets of the ftandard g, whereby 
the magazine eafily turns, as on an axis; and is fo well 
poized as to ftand in any inclination of the line ns ; and 
in this the equilibrium is aftifted by the ftrong maho- 
gany femi-circular pieces ll, fixed in a vertical pofition to 
2. the 
